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固定化解淀粉芽孢杆菌 TSWK1-1 的α-淀粉酶以提高其生物催化性能和溶剂耐受性。

Immobilization of the α-amylase of Bacillus amyloliquifaciens TSWK1-1 for the improved biocatalytic properties and solvent tolerance.

机构信息

UGC-CAS Department of Biosciences, Saurashtra University, Rajkot 360 005, Gujarat, India.

出版信息

Bioprocess Biosyst Eng. 2013 May;36(5):567-77. doi: 10.1007/s00449-012-0812-3. Epub 2012 Sep 9.

Abstract

The α-amylase of Bacillus amyloliquifaciens TSWK1-1 (GenBank Number, GQ121033) was immobilized by various methods, including ionic binding with DEAE cellulose, covalent coupling with gelatin and entrapment in polyacrylamide and agar. The immobilization of the purified enzyme was most effective with the DEAE cellulose followed by gelatin, agar and polyacrylamide. The K m increased, while V max decreased upon immobilization on various supports. The temperature and pH profiles broadened, while thermostability and pH stability enhanced after immobilization. The immobilized enzyme exhibited greater activity in various non-ionic surfactants, such as Tween-20, Tween-80 and Triton X-100 and ionic surfactant, SDS. Similarly, the enhanced stability of the immobilized α-amylase in various organic solvents was among the attractive features of the study. The reusability of the immobilized enzyme in terms of operational stability was assessed. The DEAE cellulose immobilized α-amylase retained its initial activity even after 20 consequent cycles. The DEAE cellulose immobilized enzyme hydrolyzed starch with 27 % of efficiency. In summary, the immobilization of B. amyloliquifaciens TSWK1-1 α-amylase with DEAE cellulose appeared most suitable for the improved biocatalytic properties and stability.

摘要

地衣芽孢杆菌 TSWK1-1(GenBank 编号:GQ121033)α-淀粉酶通过各种方法固定化,包括与 DEAE 纤维素离子结合、与明胶共价偶联以及包埋在聚丙烯酰胺和琼脂中。固定化酶的最佳方法是 DEAE 纤维素,其次是明胶、琼脂和聚丙烯酰胺。固定化后,Km 值增加,Vmax 值降低。固定化后,温度和 pH 谱变宽,热稳定性和 pH 稳定性增强。固定化酶在各种非离子表面活性剂(如 Tween-20、Tween-80 和 Triton X-100)和离子表面活性剂 SDS 中表现出更高的活性。同样,固定化 α-淀粉酶在各种有机溶剂中的稳定性增强也是该研究的一个吸引人的特点。评估了固定化酶在操作稳定性方面的可重复使用性。DEAE 纤维素固定化 α-淀粉酶即使在 20 次连续循环后仍保持其初始活性。DEAE 纤维素固定化酶对淀粉的水解效率为 27%。总之,DEAE 纤维素固定化地衣芽孢杆菌 TSWK1-1α-淀粉酶最适合改善生物催化特性和稳定性。

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